pyspark-dataframes

问题 I am trying to connect to MS SQL DB from PySpark using spark.read.jdbc import os from pyspark.sql import * from pyspark.sql.functions import * from pyspark import SparkContext; from pyspark.sql.session import SparkSession sc = SparkContext.getOrCreate() spark = SparkSession(sc) df = spark.read \ .format('jdbc') \ .option('url', 'jdbc:sqlserver://local:1433') \ .option('user', 'sa') \ .option('password', '12345') \ .option('dbtable', '(select COL1, COL2 from tbl1 WHERE COL1 = 2)') then I do df

问题 I am trying to connect to MS SQL DB from PySpark using spark.read.jdbc import os from pyspark.sql import * from pyspark.sql.functions import * from pyspark import SparkContext; from pyspark.sql.session import SparkSession sc = SparkContext.getOrCreate() spark = SparkSession(sc) df = spark.read \ .format('jdbc') \ .option('url', 'jdbc:sqlserver://local:1433') \ .option('user', 'sa') \ .option('password', '12345') \ .option('dbtable', '(select COL1, COL2 from tbl1 WHERE COL1 = 2)') then I do df

问题 I have to add a customized condition, which has many columns in .withColumn. My scenario is somewhat like this. I have to check many columns row wise if they have Null values, and add those column names to a new column. My code looks somewhat like this: df= df.withColumn("MissingColumns",\ array(\ when(col("firstName").isNull(),lit("firstName")),\ when(col("salary").isNull(),lit("salary")))) Problem is I have many columns which I have to add to the condition. So I tried to customize it using

问题 I have to add a customized condition, which has many columns in .withColumn. My scenario is somewhat like this. I have to check many columns row wise if they have Null values, and add those column names to a new column. My code looks somewhat like this: df= df.withColumn("MissingColumns",\ array(\ when(col("firstName").isNull(),lit("firstName")),\ when(col("salary").isNull(),lit("salary")))) Problem is I have many columns which I have to add to the condition. So I tried to customize it using

来源： https://stackoverflow.com/questions/64039632/convert-132k-to-132000-and-224-4m-to-224-400-000-in-pyspark-dataframe

来源： https://stackoverflow.com/questions/63537324/can-i-use-regexp-replace-or-some-equivalent-to-replace-multiple-values-in-a-pysp

来源： https://stackoverflow.com/questions/63288316/pyspark-count-the-consecutive-cell-in-the-column-with-condition

来源： https://stackoverflow.com/questions/64084727/pyspark-how-to-solve-complicated-dataframe-logic-plus-join

来源： https://stackoverflow.com/questions/63634488/using-or-operator-for-each-element-of-an-array-in-single-when-function-of-pysp

来源： https://stackoverflow.com/questions/58812665/how-to-dismantle-clob-in-pyspark